Like Brian said more than one way to skin a cat. Lot depends on the fastener size and application.
Most times you time fasteners by removing material under the head. In a lathe you can just about get a screw timed by calculating how much it moves per turn and removing what’s needed to time. I like to get it close using a indicator then very light cuts to bring it into time. Best example I can give is installing a rifle barrel. It has to screw up tight and keep extractor cuts sight screws & dovetails properly alligned. How tight is more feel than measure with something like a torque wrench. Octagon barrels alignment is particularly critical. Round barrel often times not difficult, fitting the barrel and cutting for extractor and sights after. About the same idea as cutting the slot after the screw bottoms out.
It’s a important gunsmith skill.
Willam
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